Collision-Induced Bands of Lithium-Rare Gas Molecules

Date of Award

Fall 10-1983

Document Type


Degree Name

Master of Science (MS)



Committee Director

Mark D. Havey

Committee Member

Gilbert R. Hoy

Committee Member

Gary E. Copeland

Committee Member

James L. Cox, Jr.

Committee Member

Desmond Cook

Call Number for Print

Special Collections LD4331.P48W35


Lithium vapor is optically excited by two-step laser excitation of the 3d state in the presence of the rare gases He, Ne, Ar, Kr, and Xe. Collision induced bands are observed in Li-Ar, Li-Kr, and Li-Xe mixtures. The bands are believed to be due to transitions to the dissociating 2s~ ground state from states above the 2p state of the Li-RG molecules. The Li-Ar, Li-Kr, and Li-Xe 3sб -2sб collision induced bands are progressively shifted, for the heavier rare gases, further to the red of the asymptotic atomic Li 3s-2s energy difference. A qualitative comparison is made between the spectra and the adiabatic potential curves calculated by Pascale and Vandeplanque, with the conclusion that the calculated potentials are not deep enough. Emission from Li 3d, 3P, and 3s states, resulting from quenching and radiative transition processes, is, also measured. From the pressure dependence of the normalized Li fluorescence intensity, rate coefficients for quenching of the atomic Li 3d and 3P states by the five gases are determined.


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